how to use fuzztest on Android(aarch64)

Hi, I'm trying to follow the [tutorial](https://github.com/google/fuzztest/blob/main/doc/quickstart-cmake.md) to build fuzztest for Android(aarch64), but I failed, here is my CMakeLists.txt

```makefile
cmake_minimum_required(VERSION 3.19)
project(first_fuzz_project)

set(CMAKE_CXX_STANDARD 17)

add_subdirectory(fuzztest)

enable_testing()

include(GoogleTest)

add_executable(
first_fuzz_test
first_fuzz_test.cc
)

set(ANDROID_API_VER 29)
set(ABARCH1 arm64)
set(CMAKE_SYSTEM_PROCESSOR aarch64)
set(NDK /home/muhe/Android/Sdk/ndk/21.1.6352462/)
set(CROSS_SYSROOT "${NDK}/platforms/android-${ANDROID_API_VER}/arch-${ABARCH1}")
set(BUILD_ARCH linux-x86_64)

set(TC_PATH ${NDK}/toolchains/llvm/prebuilt/${BUILD_ARCH})
set(TC_BASE ${TC_PATH}/bin/${CMAKE_SYSTEM_PROCESSOR}-linux-android)
set(PLATFORM android)
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_C_COMPILER "${TC_BASE}${ANDROID_API_VER}-clang")
set(CMAKE_CXX_COMPILER "${TC_BASE}${ANDROID_API_VER}-clang++")
set(CMAKE_STAGING_PREFIX "${CROSS_SYSROOT}")

set(CMAKE_FIND_ROOT_PATH "${CROSS_SYSROOT}")
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

link_fuzztest(first_fuzz_test)
gtest_discover_tests(first_fuzz_test)
```

It seems fuzztest now only support x86:
- `_deps` will build for x86_64, not aarch64 as I specified, so I will get error as following:
```bash
_deps/re2-build/libre2.a(compile.cc.o) is incompatible with aarch64linux
```
- fuzztest will link `-lrt`, so I just deleted all the `-lrt` to continuing the building process

So does fuzztest currently support aarch64? Or will aarch64 be supported in the future?